Answer
d.
Work Step by Step
During the Precambrian time, prokaryotes and eukaryotes evolved. The Precambrian time lasted from the time Earth formed about 4.57 billion years ago to about 630 million years ago. The first prokaryotes arose 3.5 billion years ago. The first eukaryotes arose about 2.1 billion years ago. Eukaryotes became multicellular when the first soft-bodied invertebrates appeared about 630 million years ago.
